An area efficiency hybrid decoupling scheme for charge pump noise suppression in non-volatile memory

Mengshu Huang, Leona Okamura, Tsutomu Yoshihara

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    An area efficiency hybrid decoupling scheme is proposed to suppress the charge pump noise during F-N tunneling program in nonvolatile memory (NVM). The proposed scheme is focused on suppressing the average noise power in frequency domain aspect, which is more suitable for the program error reduction in NVMs. The concept of active capacitor is utilized. Feed forward effect of the amplifier is firstly considered in the impedance analysis, and a trade-off relation between in-band and out-band frequency noise decoupling performance is shown. A fast optimization based on average noise power is made to achieve minimum error in the FN tunneling program. Simulation results show very stable output voltage in different load conditions, the average ripple voltage is 17mV with up to 20 dB noise-suppression-ratio (NSR), and the F-N tunneling program error is less than 5mV for a 800 μs program pulse. A test chip is also fabricated in 0.18 μm technology. The area overhead of the proposed scheme is 2%. The measurement results show 24.4mV average ripple voltage compared to 72.3mV of the conventional one with the same decoupling capacitance size, while the noise power suppression achieves 15.4 dB.

    Original languageEnglish
    Pages (from-to)968-976
    Number of pages9
    JournalIEICE Transactions on Electronics
    VolumeE94-C
    Issue number6
    DOIs
    Publication statusPublished - 2011 Jun

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    Keywords

    • Charge pump
    • Hybrid decoupling
    • Program noise suppression

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Electronic, Optical and Magnetic Materials

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